The AES specifies three key sizes: 128, 192 and 256 bits
-config CRYPTO_AES_TI
- tristate "AES (Advanced Encryption Standard) (fixed time)"
- select CRYPTO_ALGAPI
- select CRYPTO_LIB_AES
- help
- AES cipher algorithms (Rijndael)(FIPS-197, ISO/IEC 18033-3)
-
- This is a generic implementation of AES that attempts to eliminate
- data dependent latencies as much as possible without affecting
- performance too much. It is intended for use by the generic CCM
- and GCM drivers, and other CTR or CMAC/XCBC based modes that rely
- solely on encryption (although decryption is supported as well, but
- with a more dramatic performance hit)
-
- Instead of using 16 lookup tables of 1 KB each, (8 for encryption and
- 8 for decryption), this implementation only uses just two S-boxes of
- 256 bytes each, and attempts to eliminate data dependent latencies by
- prefetching the entire table into the cache at the start of each
- block. Interrupts are also disabled to avoid races where cachelines
- are evicted when the CPU is interrupted to do something else.
-
config CRYPTO_ANUBIS
tristate "Anubis"
depends on CRYPTO_USER_API_ENABLE_OBSOLETE
+++ /dev/null
-// SPDX-License-Identifier: GPL-2.0-only
-/*
- * Scalar fixed time AES core transform
- *
- * Copyright (C) 2017 Linaro Ltd <ard.biesheuvel@linaro.org>
- */
-
-#include <crypto/aes.h>
-#include <crypto/algapi.h>
-#include <linux/module.h>
-
-static int aesti_set_key(struct crypto_tfm *tfm, const u8 *in_key,
- unsigned int key_len)
-{
- struct crypto_aes_ctx *ctx = crypto_tfm_ctx(tfm);
-
- return aes_expandkey(ctx, in_key, key_len);
-}
-
-static void aesti_encrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
-{
- const struct crypto_aes_ctx *ctx = crypto_tfm_ctx(tfm);
- unsigned long flags;
-
- /*
- * Temporarily disable interrupts to avoid races where cachelines are
- * evicted when the CPU is interrupted to do something else.
- */
- local_irq_save(flags);
-
- aes_encrypt(ctx, out, in);
-
- local_irq_restore(flags);
-}
-
-static void aesti_decrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
-{
- const struct crypto_aes_ctx *ctx = crypto_tfm_ctx(tfm);
- unsigned long flags;
-
- /*
- * Temporarily disable interrupts to avoid races where cachelines are
- * evicted when the CPU is interrupted to do something else.
- */
- local_irq_save(flags);
-
- aes_decrypt(ctx, out, in);
-
- local_irq_restore(flags);
-}
-
-static struct crypto_alg aes_alg = {
- .cra_name = "aes",
- .cra_driver_name = "aes-fixed-time",
- .cra_priority = 100 + 1,
- .cra_flags = CRYPTO_ALG_TYPE_CIPHER,
- .cra_blocksize = AES_BLOCK_SIZE,
- .cra_ctxsize = sizeof(struct crypto_aes_ctx),
- .cra_module = THIS_MODULE,
-
- .cra_cipher.cia_min_keysize = AES_MIN_KEY_SIZE,
- .cra_cipher.cia_max_keysize = AES_MAX_KEY_SIZE,
- .cra_cipher.cia_setkey = aesti_set_key,
- .cra_cipher.cia_encrypt = aesti_encrypt,
- .cra_cipher.cia_decrypt = aesti_decrypt
-};
-
-static int __init aes_init(void)
-{
- return crypto_register_alg(&aes_alg);
-}
-
-static void __exit aes_fini(void)
-{
- crypto_unregister_alg(&aes_alg);
-}
-
-module_init(aes_init);
-module_exit(aes_fini);
-
-MODULE_DESCRIPTION("Generic fixed time AES");
-MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>");
-MODULE_LICENSE("GPL v2");
projects / thirdparty / kernel / linux.git / commitdiff
